package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;


@RestController
@Slf4j
@RequestMapping("/dish")
public class DishController {

        @Autowired
        private DishService dishService;
        @Autowired
        private DishFlavorService dishFlavorService;
        @Autowired
        private CategoryService categoryService;
        @Autowired
        private RedisTemplate redisTemplate;

        /**
         * 添加菜品
         * @param dishDto
         * @return
         */
        @PostMapping
        public R<String> save(@RequestBody DishDto dishDto){
                log.info(dishDto.toString());

                dishService.saveWithFlavor(dishDto);

                return R.success("新增菜品成功");
        }

        /**
         * 分页查询菜单列表
         * @param page
         * @param pageSize
         * @param name
         * @return
         */
        @GetMapping("/page")
        public R<Page> Page(int page, int pageSize, String name){

                //构造分页构造器
                Page<Dish> pageInfo = new Page<>(page,pageSize);
                Page<DishDto> dishDtoPage = new Page<>();  //显示菜品分类

                //构造条件构造器
                LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
                //添加排序条件
                queryWrapper.orderByDesc(Dish::getUpdateTime);
                //添加过滤条件 不为空 按name列表排序 输入的name值  StringUtils.isNotEmpty(name)  ==  name != null
                queryWrapper.like(StringUtils.isNotEmpty(name),Dish::getName,name);

                //执行查询
                dishService.page(pageInfo,queryWrapper);

                //对象拷贝
                BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");  //拷贝pageInfo去dishDtoPage 忽略records（一堆实体对象）

                List<Dish> records = pageInfo.getRecords();             //因为拷贝的类型不一样 所以手动处理拷贝

                List<DishDto> list = records.stream().map((item) -> {       //遍历records装在map（item）里

                        DishDto dishDto = new DishDto();
                        BeanUtils.copyProperties(item,dishDto);               //item拷贝到dishDto来找分类id间接通过数据库获得
                        Long categoryId = item.getCategoryId();//分类id
                        //根据id查询分类对象
                        Category category = categoryService.getById(categoryId);      //遍历 获取该item的分类

                        if(category != null){
                                String categoryName = category.getName();           //获取分类名
                                dishDto.setCategoryName(categoryName);           //设置分类名
                        }
                        return dishDto;
                }).collect(Collectors.toList());

                dishDtoPage.setRecords(list);

                return R.success(pageInfo);
        }

        /**
         * 根据id查询菜品信息和菜品口味信息（修改菜品信息回显
         * @param id
         * @return
         */
        @GetMapping("/{id}")
        public R<DishDto> get(@PathVariable Long id){
                DishDto dishDto = dishService.getIdWithFlavor(id);
                return R.success(dishDto);
        }

        /**
         * 修改菜品
         * @param dishDto
         * @return
         */
        @PutMapping
        public R<String> update(@RequestBody DishDto dishDto){

                log.info(dishDto.toString());

                dishService.updateWithFlavor(dishDto);

//                //清理所有菜品的缓存数据
//                Set keys = redisTemplate.keys("dish_*"); //获取所有以dish_xxx开头的key
//                redisTemplate.delete(keys); //删除这些key

                //清理某个分类下面的菜品缓存数据
                String key = "dish_" + dishDto.getCategoryId() + "_1";
                redisTemplate.delete(key);

                return R.success("修改菜品成功");
        }

        /**
         * 根据条件查询分类对应的菜品数据（添加套餐的添加菜品菜品展示
         * （用户端菜品套餐分类中对应的菜品信息显示
         * @param dish
         * @return
         */
        /*@GetMapping("/list")
        public R<List<Dish>> list(Dish dish){
                //条件构造器
                LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
                queryWrapper.eq(dish.getCategoryId() != null,Dish::getCategoryId,dish.getCategoryId());

                //添加条件,查询启售菜品（状态为1的菜品）
                queryWrapper.eq(Dish::getStatus,1);

                //添加排序条件
                queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

                List<Dish> list = dishService.list(queryWrapper);

                return R.success(list);*/

        @GetMapping("/list")
        public R<List<DishDto>> list(Dish dish){

                List<DishDto> dishDtoList = null;

                //动态构造key
                String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();

                dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get(key);

                if (dishDtoList != null) {
                        //如果存在菜品信息，直接返回无需查数据库
                        return R.success(dishDtoList);
                }

                //条件构造器
                LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
                queryWrapper.eq(dish.getCategoryId() != null,Dish::getCategoryId,dish.getCategoryId());

                //添加条件,查询启售菜品（状态为1的菜品）
                queryWrapper.eq(Dish::getStatus,1);

                //添加排序条件
                queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

                List<Dish> list = dishService.list(queryWrapper);

                /**
                 * //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
                 * 用户端加入购物车添加菜品中（选择规格按钮） 菜品口味信息显示
                 */
                dishDtoList = list.stream().map((item) -> {
                        DishDto dishDto = new DishDto();
                        BeanUtils.copyProperties(item,dishDto);

                        Long categoryId = item.getCategoryId();//分类id
                        //根据id查询分类对象
                        Category category = categoryService.getById(categoryId);
                        if(category != null){
                                String categoryName = category.getName();
                                dishDto.setCategoryName(categoryName);
                        }

                        //当前菜品的id
                        Long dishId = item.getId();
                        LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
                        lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
                        //SQL:select * from dish_flavor where dish_id = ?
                        List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
                        dishDto.setFlavors(dishFlavorList);

                        return dishDto;
                }).collect(Collectors.toList());

                redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

                return R.success(dishDtoList);
        }


}
